/Engine/Plugins/Runtime/MassEntity/Source/MassEntity/Public/MassProcessingPhaseManager.h
Called by the given Phase at the very start of its execution function (theFMassProcessingPhase::ExecuteTick), even before theFMassProcessingPhase.OnPhaseStartbroadcast delegate
void OnPhaseStart ( const [FMassProcessingPhase](API\Plugins\MassEntity\FMassProcessingPhase) & Phase )